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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <sys/types.h>
#include <algorithm>
#include <memory>
// This class is used instead of std::string or std::vector because their clear(), erase(), etc
// functions don't actually deallocate. shrink_to_fit() does deallocate but is not guaranteed to
// work and swapping with an empty string/vector is clunky.
class SerializedData {
public:
SerializedData() {}
SerializedData(size_t size) : data_(new uint8_t[size]), size_(size) {}
void Resize(size_t new_size) {
if (size_ == 0) {
data_.reset(new uint8_t[new_size]);
size_ = new_size;
} else if (new_size == 0) {
data_.reset();
size_ = 0;
} else if (new_size != size_) {
std::unique_ptr<uint8_t[]> new_data(new uint8_t[new_size]);
size_t copy_size = std::min(size_, new_size);
memcpy(new_data.get(), data_.get(), copy_size);
data_.swap(new_data);
size_ = new_size;
}
}
uint8_t* data() { return data_.get(); }
const uint8_t* data() const { return data_.get(); }
size_t size() const { return size_; }
private:
std::unique_ptr<uint8_t[]> data_;
size_t size_ = 0;
};
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